“We need to get tough and stay tough to meet the demands placed on us as we age physically, emotionally and otherwise,” she says.

“If we keep moving, adapt what we are doing to meet our bodies' needs and are willing to be flexible - which sometimes means finding alternative activities if the one we are performing becomes too difficult or painful – we can move successfully into our 40s, 50s, 60s, 70s, 80s and beyond.”

Ideally, people should establish good fitness and nutrition habits in their 20s, Ms. Pell says. In reality, however, many people don't consider how the choices they made as young adults could affect them in their middle-age and golden years.

Whether you've never exercised before or you're an aging fitness buff who is slowing down due to injuries or health issues, Ms. Pell says you can – and should – exercise.

She offers these 14 tips for adapting your routine at any age:

Warm up. Spend a few minutes walking on a treadmill, doing jumping jacks (or heel jacks) or, if you're an athlete, mimicking movements you'll use during the match or game. “Our tissues, muscles and joints can't do in our 50s and 60s what they did in our 20s and 30s,” Ms. Pell says.

Pay attention to form. If necessary, slow down to ensure your body is in proper alignment.

Add strength training three to four days a week. This helps preserve muscle mass, which is difficult to regain. Depending on your fitness level, strength training can be done with light hand weights or just your body weight. Consult a physical therapist or certified fitness trainer if you're new to strength training.

Make training adjustments. If you're an avid runner or tennis player finding yourself with more aches and pains than you used to have, consider adding a gentler activity, such as yoga or swimming. “This allows the body to recover from the demands of the more rigorous exercise,” Ms. Pell says. “If injured, they may have to make some hard decisions as they recover as to whether they can return to those sports or choose something less stressful.”

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